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Subject: Re: [Linux-ia64] patch to no longer use ia64's software mmu
To: davidm@hpl.hp.com
Date: Tue, 4 Dec 2001 18:19:55 +0000 (GMT)
Cc: alan@lxorguk.ukuu.org.uk (Alan Cox), tony.luck@intel.com,
        arjanv@redhat.com (Arjan van de Ven), linux-kernel@vger.kernel.org,
        linux-ia64@linuxia64.org, marcelo@conectiva.com.br, davem@redhat.com
In-Reply-To: <15373.4236.462183.167170@napali.hpl.hp.com> from "David Mosberger" at Dec 04, 2001 10:06:04 AM
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From: Alan Cox <alan@lxorguk.ukuu.org.uk>
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>   Alan> I don't see the need: GFP_DMA is the ISA DMA zone. pci_* API
>   Alan> is used by everyone else [for 2.5].
> 
> Without a 4GB zone, you may end up creating bounce buffers needlessly
> for 32-bit capable DMA devices, no?

Yes - but it becomes an implementation detail. Drivers don't go around
asking for kmalloc in 4Gb zone anymore they ask for PCI memory that a 32bit
pci address can hit. I'm sure a 4Gb zone is what will be there internally
but you don't need GFP_4GBZONE as a visible driver detail.

Alan


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